Synthesis and Phase Structures of Mesogen-Jacketed Liquid Crystalline Polymers Containing 1,3,4-Oxadiazole Based Side Chains
Synthesis and Phase Structures of Mesogen-Jacketed Liquid Crystalline Polymers Containing 1,3,4-Oxadiazole Based Side Chains
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DOI：
10.1021/ma071670t
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发表时间：
2007-11
期刊：
影响因子：
5.5
通讯作者：
C. Chai;Xing-Qi Zhu;Ping Wang;Min Ren;Xiaofang Chen;Yiding Xu;Xinghe Fan;Chunmin Ye;E. Che
中科院分区：
文献类型：
--
作者：
C. Chai;Xing-Qi Zhu;Ping Wang;Min Ren;Xiaofang Chen;Yiding Xu;Xinghe Fan;Chunmin Ye;E. Che
A series of new monomers of 2,5-bis[(4-tertbutyl-phenyl)-1,3,4-oxadiazole] styrene (M-Ct) and 2,5-bis[(4-alkoxy-phenyl)-1,3,4-oxadiazole]styrene (M−OCm, m is the number of the carbons in the alkoxy groups, m = 8, 10, 12, 14) were synthesized. Conventional radical polymerization of the monomers resulted in a series of new mesogen-jacketed liquid crystalline polymer (MJLCP) containing the 1,3,4-oxadiazole unit. The chemical structures of the monomers were confirmed by elemental analysis, mass spectrometry, 1H NMR, and IR. The molecular characterization of the corresponding polymers of P-Ct and P-OCms was performed with 1H NMR, gel permeation chromatography, and thermogravimetric analysis. Their phase structures and transitions were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, and polarized light microscopy experiments. The P-Ct formed the hexatic columnar nematic (ΦHN) phase that is typical for MJLCPs, wherein the chain molecules were rodlike. The P-OCms exhibited a well-...
